Compressor



July 9, 1929. w. FRELLWITZ COMPRESSOR Filed Dec. 27, 1927 2 Sheets-Sheet 1 INVENTOR.

Idfilh- 121F019 [1013? Hi5 ATT NEX J y 9, 2 w. PRELLWITZ 1.719.998-

' COMPRESSOR Filed Dec. 27, 1927 2 Sheets-Sheet '2 Wi LPINVENTOR y 4 am lurJ all) Patented July 9, 1929.

' mama UNITEDSTATES PATENT ,OFFlCE.

WILLIAM PBIJLLWITZ, OF EASTON, PENN$YLVAN1IA, ASEIGNOR TU IMGYERSO'LL-BANTD COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF INEVV JERSEY.

CGMIRESSOR.

Application filed December 27, 1927.

This invention relates to compressors, but more particularly to the cylinder heads of compressors in which the heads serve as water jackets in addition to their normal function as closures for the cylinder. I

The object of the invention is to increase the elliciency of the compressor by bringing the air admitted by the inlet valves into intimate contact with a large area of cooling surface in the cylinder.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of elements and arrangement of parts hav ing the general mode of operation substantially as hereinafter described and claimed and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal sectional clcvation of a compressor having the invention applied thereto,

Figure 2 is a transverse view taken through Figure 1 on the line 2-2 looking in the direction indicated by the arrows,

Figure 3 is a view through Figure 2 on the line 33 looking in the direction indicated by the arrows,

Figure 4- is a. view similar to Figure 1 showing a modification of the invention,

Figure 5 is a transverse View taken through Figure 4 on the line 5--5 indicated by the arrows, and

Figure 6 is a sectional plan view taken through Figure 4 011 the line 66 looking in the direction indicated by the arrows.

Referring to the drawings, the invention is shown embodied in a double acting compressor generally designated by A and having a cylinder B closed at its ends by heads C and D. The cylinder B is provided. with a piston E having a rod F extending slidably through the head D.

In one side of the cylinder is an inlet chan1- ber F which communicates with the atmosphere through an inlet opening G. The ad mission of air from the inlet chamber F into the cylinder 13 is controlled by inlet valves I-I located in the cylinder 13 and near the ends thereof. a

The air compressed in the cylinder B is discharged therefroln through discharge valves J into a discharge chamber II from whence it may pass through a discharge opening la in the cylinder it to receiver tank that shown} Scrial No. 242,861.

In accordance with the present invention, hollow pro cctionsl) and P are formed on the headsl) and C respectively. The projections extend into the ends of the cylinder and may partly overlap the valves J and II. The interior of the projections O and l? together with the heads I) and C and a chant her Q encircling the cylinder 13 constitute a water j aekct for the cylinder B.

The innermost o 1' free ends of the projections U and l? are flared in an outwardly direction as at It to restrict the entrances E5 of annular chambers T encircling the projections. In the periphery of the projections (l and I are grooves U formed ecccntrically with respect to the ends of the projections and disposed so that a greater area of space exists adjacent the discharge valve J than at the inlet valve II. In this way the chamber T is somewhat restricted near the inlet valves and, in consequence, the air upon entrance into the cylinder is brought into intimate contact with a greater area of cooling surface than it would were the chamber T formed concentrically with respect to the cylinder.

In order to insure free communication be tween the ends of the cylinder and the valves H and J, the projections O and P are provided with flattened surfaces V adjacent the valves H and J.

In the modification illustrated in Figures t to 6 inclusive, the projections O and I are provided with external annular grooves W formed concentrically with respect to the cylinder B to form annular chambers X around the projections of substantially uniform cross sectional area.

Adjacent the valves J and II and on the ends of the projections O and P are formed flattened inclined surfaces Y and Z to afford relatively free communication between the ends of the cylinder and the valves. In this modification there are no restricted areas other than that at the entrances S of the an nular chambers X, the air admitted into the cylinder during the compression stroke and the air exhausted from the cylinder being brought uniformly into contact with the entire cooling surface provided by the projections 0 and P.

The present invention has been found to increase the etliciency of the compressor considerably. This due chiefly to the manner in. which practically all. of the inccinl in; air

with the cool surfaces of the projections O and P. Due to this feature, the heat absorbed by the air during its passage through the inlet valves is again immediately removed before the compression stroke of the piston and a greatervolume of air may therefore flow into the cylinder on each suction stroke of the piston than would be the case were the air compressed at the volume to which it expands due to its contact with the comparatively hot inlet valves.

I claim:

1. In a compressor, a cylinder provided With inlet and discharge valves, heads for the cylinder having projections extending into the cylinder to form annular chambers in the 7 ends of the cylinder adjacent the valves, said chambers being restricted at their entrance ends.

,2. In a compressor, a cylinder provided with inlet and discharge valves, and heads forthe cylinder having projections extending into the cylinder to form annular chambers in the ends of the cylinder, said proj ections being hollow to serve as water jackets and partially overlapping the valves, said annular chambers being restricted at their entrance ends.

3. In a compressor, a cylinder provided with inlet and discharge valves, heads for the cylinder, and hollow projections on the heads to serve as water jackets and extending into the cylinder to form annular chambers in the ends of the cylinder, the free ends of said projections being flared. in an outwardly direction to restrict the entrances of the chamhers, said chambers being 01 greater extent adjacent the. discharge valves than at the inlet valves.

4. In a compressor, a cylinder provided with inlet and discharge valves, heads for the cylinder, and hollow projections on the heads to serve as water jackets and extending into the cylinder to form annular chambers in the ends of the cylinder, the free ends of said projections being concentric with the cylinder and flared in an outwardly direction to restrict the entrances of the chambers, said projections having eccentrically disposed external grooves to increase the area of the annular chambers adjacent the discharge valves.

In testimony whereof I have signed this specification.

WILLIAM PRELLVVI'JZ. 

